It is imperative to remove phosphate from the aquatic system. This nutrient in excess can cause environmental problems such as eutrophication. Therefore, aiming to enhance phosphate removal, this work presents a novel adsorbent developed from the construction of Ca/Fe layer double hydroxides (CaFe/LDH) supported onto biochar physically activated with CO [CaFe/biochar (CO)]. Pristine biochar was produced from the pyrolysis of Eucalyptus saligna sawdust, activated with CO, and then impregnated with CaFe/LDH. The CaFe/biochar (CO) was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET). The characterization confirmed a proper synthesis of the new adsorbent. Experiments were conducted in the form of batch adsorption. Results indicated that the optimum pH and adsorbent dosage were 2.15 and 0.92 g L, respectively. Adsorption kinetics, isotherms, and thermodynamics were also evaluated. Adsorption kinetics and isotherms were better fitted by the pseudo n order and Freundlich models, respectively. Results also indicated a better adsorption capacity (99.55 mg·g) at 55 °C. The thermodynamic indicators depicted that the adsorption process was favorable, spontaneous, and endothermic. Overall, CaFe/biochar (CO) could be potentially applied for the adsorptive removal of phosphate from an aqueous solution.
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| http://dx.doi.org/10.2166/wst.2022.332 | DOI Listing |
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